How do I write a mutator?

[Lieutenant Skittles]

For example one that decreases the health of the bosses. Can someone walk me through step-by-step by any chance? I've tried to wrap my head around it but I can't.

 

[[TW] Zane]

Here is the code the the Max players mutator:

class KFMutator_MaxPlayers extends KFMutator
    Config(MaxPlayers);

var globalconfig int MaxPlayers;
var globalconfig int MaxPlayersAllowed;

function InitMutator(string Options, out string ErrorMessage)
{
    MyKFGI = KFGameInfo( WorldInfo.Game );
    if(MyKFGI != none)
    {
        MyKFGI.MaxPlayers = MaxPlayers;
        MyKFGI.MaxPlayersAllowed = MaxPlayersAllowed;
        `log("SUCCESS!  Max players set to:" @MaxPlayers @"Max allowed players set to:" @MaxPlayersAllowed);
    }    
}

Basically what you are going to want to do is extend off of KFMutator. From there you can edit game parameters to modify your gameplay experience.

Here is a Wiki on how to make a mod:

https://tripwireinteractive.atlassian.net/wiki/display/KF2SW/KF2+Code+Modding+How-to